Fixed #3218 -- Implemented django.contrib.formtools.wizard. Thanks, Honza and...

Fixed #3218 -- Implemented django.contrib.formtools.wizard. Thanks, Honza and Oyvind. Note that there are no docs yet

git-svn-id: http://code.djangoproject.com/svn/django/trunk@7236 bcc190cf-cafb-0310-a4f2-bffc1f526a37